Patents by Inventor Darwin D. Demeny

Darwin D. Demeny has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Formed corrugated plastic net for drainage applications
    Patent number: 4749306
    Abstract: Corrugated net thermoformed in a variety of differently shaped upstanding projections disposed on opposing surfaces of the netting to provide flow channels for draining ground water.
    Type: Grant
    Filed: September 5, 1986
    Date of Patent: June 7, 1988
    Assignee: Leucadia, Inc.
    Inventors: Darwin D. Demeny, Robert C. Slocumb